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Give iSCSI and disk storage backend drivers the

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ability to resolve any kind of volume path to the pool target volume
path.  For instance, if the pool was defined with a
<target><path>/dev/disk/by-id</path></target> section, and one of the
volumes is /dev/disk/by-id/scsi-S_beaf11, then you would be able to
call virStorageVolLookupByPath("/dev/sdc"), and get the correct volume
back.

Signed-off-by: Chris Lalancette <clalance@redhat.com>
This commit is contained in:
Chris Lalancette 2008-11-03 11:37:11 +00:00
parent 7d3041aff3
commit 17a9e03cd1
6 changed files with 58 additions and 13 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
Mon Nov 03 12:37:00 CET 2008 Chris Lalancette <clalance@redhat.com>
* src/storage_backend.c src/storage_backend.h
src/storage_backend_disk.c src/storage_backend_iscsi.c
src/storage_driver.c: Give iSCSI and disk storage backend drivers the
ability to resolve any kind of volume path to the pool target volume
path. For instance, if the pool was defined with a
<target><path>/dev/disk/by-id</path></target> section, and one of the
volumes is /dev/disk/by-id/scsi-S_beaf11, then you would be able to
call virStorageVolLookupByPath("/dev/sdc"), and get the correct volume
back.
Fri Oct 31 14:55:46 CET 2008 Daniel Veillard <veillard@redhat.com>
* python/virConnect.py: needed for events from the python bindings

15
src/storage_backend.c
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@ -357,16 +357,17 @@ virStorageBackendUpdateVolInfoFD(virConnectPtr conn,
char *
virStorageBackendStablePath(virConnectPtr conn,
virStoragePoolObjPtr pool,
char *devpath)
const char *devpath)
{
DIR *dh;
struct dirent *dent;
char *stablepath;
/* Short circuit if pool has no target, or if its /dev */
if (pool->def->target.path == NULL ||
STREQ(pool->def->target.path, "/dev") ||
STREQ(pool->def->target.path, "/dev/"))
return devpath;
goto ret_strdup;
/* The pool is pointing somewhere like /dev/disk/by-path
* or /dev/disk/by-id, so we need to check all symlinks in
@ -382,7 +383,6 @@ virStorageBackendStablePath(virConnectPtr conn,
}
while ((dent = readdir(dh)) != NULL) {
char *stablepath;
if (dent->d_name[0] == '.')
continue;
@ -407,10 +407,17 @@ virStorageBackendStablePath(virConnectPtr conn,
closedir(dh);
ret_strdup:
/* Couldn't find any matching stable link so give back
* the original non-stable dev path
*/
return devpath;
stablepath = strdup(devpath);
if (stablepath == NULL)
virStorageReportError(conn, VIR_ERR_NO_MEMORY, "%s", _("dup path"));
return stablepath;
}

3
src/storage_backend.h
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@ -50,6 +50,7 @@ enum {
VIR_STORAGE_BACKEND_POOL_SOURCE_DIR = (1<<2),
VIR_STORAGE_BACKEND_POOL_SOURCE_ADAPTER = (1<<3),
VIR_STORAGE_BACKEND_POOL_SOURCE_NAME = (1<<4),
VIR_STORAGE_BACKEND_POOL_STABLE_PATH = (1<<5),
};
enum partTableType {
@ -138,7 +139,7 @@ int virStorageBackendUpdateVolInfoFD(virConnectPtr conn,
char *virStorageBackendStablePath(virConnectPtr conn,
virStoragePoolObjPtr pool,
char *devpath);
const char *devpath);
typedef int (*virStorageBackendListVolRegexFunc)(virConnectPtr conn,
virStoragePoolObjPtr pool,

6
src/storage_backend_disk.c
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@ -109,8 +109,7 @@ virStorageBackendDiskMakeDataVol(virConnectPtr conn,
devpath)) == NULL)
return -1;
if (devpath != vol->target.path)
VIR_FREE(devpath);
VIR_FREE(devpath);
}
if (vol->key == NULL) {
@ -447,7 +446,8 @@ virStorageBackend virStorageBackendDisk = {
.deleteVol = virStorageBackendDiskDeleteVol,
.poolOptions = {
.flags = (VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE),
.flags = (VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE|
VIR_STORAGE_BACKEND_POOL_STABLE_PATH),
.defaultFormat = VIR_STORAGE_POOL_DISK_UNKNOWN,
.formatFromString = virStorageBackendPartTableTypeFromString,
.formatToString = virStorageBackendPartTableTypeToString,

6
src/storage_backend_iscsi.c
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@ -219,8 +219,7 @@ virStorageBackendISCSINewLun(virConnectPtr conn, virStoragePoolObjPtr pool,
devpath)) == NULL)
goto cleanup;
if (devpath != vol->target.path)
VIR_FREE(devpath);
VIR_FREE(devpath);
if (virStorageBackendUpdateVolInfoFD(conn, vol, fd, 1) < 0)
goto cleanup;
@ -645,7 +644,8 @@ virStorageBackend virStorageBackendISCSI = {
.poolOptions = {
.flags = (VIR_STORAGE_BACKEND_POOL_SOURCE_HOST |
VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE)
VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE |
VIR_STORAGE_BACKEND_POOL_STABLE_PATH)
},
.volType = VIR_STORAGE_VOL_BLOCK,

30
src/storage_driver.c
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@ -966,8 +966,34 @@ storageVolumeLookupByPath(virConnectPtr conn,
for (i = 0 ; i < driver->pools.count ; i++) {
if (virStoragePoolObjIsActive(driver->pools.objs[i])) {
virStorageVolDefPtr vol =
virStorageVolDefFindByPath(driver->pools.objs[i], path);
virStorageVolDefPtr vol;
virStorageBackendPoolOptionsPtr options;
options = virStorageBackendPoolOptionsForType(driver->pools.objs[i]->def->type);
if (options == NULL)
continue;
if (options->flags & VIR_STORAGE_BACKEND_POOL_STABLE_PATH) {
const char *stable_path;
stable_path = virStorageBackendStablePath(conn,
driver->pools.objs[i],
path);
/*
* virStorageBackendStablePath already does
* virStorageReportError if it fails; we just need to keep
* propagating the return code
*/
if (stable_path == NULL)
return NULL;
vol = virStorageVolDefFindByPath(driver->pools.objs[i],
stable_path);
VIR_FREE(stable_path);
}
else
vol = virStorageVolDefFindByPath(driver->pools.objs[i], path);
if (vol)
return virGetStorageVol(conn,